Lindenmayer Systems

Algorithmic Botany - The definitive resource for L-Systems, this University of Calgary site is maintained by Lindenmayers collaborators. It contains many articles, and a full-length copy of 'The Algorithmic Beauty of Plants'.
http://algorithmicbotany.org/

L-Systems Explorer - A Windows-based L-System program.
http://www.generation5.org/content/2002/lse.asp

lsystem - A simple implementation of Lindenmayer systems written in Python.
http://www.alcyone.com/software/lsystem/

Lindenmayer Systems in Architecture - Architectural applications of L-systems. Includes background and methods.
http://www.mh-portfolio.com/lsystems.html

Lindenmayer System - Overview of L-systems at Wolfram MathWorld. Includes supporting links and demonstration notebook.
http://mathworld.wolfram.com/LindenmayerSystem.html

A Sketchbook on L-systems - Modeling and visualization of plants using parametric L systems.
http://coco.ccu.uniovi.es/malva/sketchbook/

Fractal Geometry: L-Systems - Introduction to L-systems by Michael Frame at Yale University. Includes background information.
http://classes.yale.edu/fractals/IntroToFrac/InitGen/LSystems/LSystems.html

L-System 4 - A program which uses text based instructions (seed files) to build complex 3D objects.
http://www.geocities.com/tperz/L4Home.htm

L-systems - A guide to the theory behind L-Systems.
http://www.math.okstate.edu/mathdept/dynamics/lecnotes/node12.html#SECTION00040000000000000000

Recursive Productions and Grammars - A guide to the rules of strict grammars including L-Systems.
http://www.cs.rit.edu/~afb/20013/plc/slides/grammars.html

L-Systems Tutorial - A mathematical introduction to how L-Systems work.
http://vlab.infotech.monash.edu.au/resources/tutorials/l-systems/

Laurens Lapre's Lparser - Windows software and some information on LSystems and related ideas.
http://home.wanadoo.nl/laurens.lapre/

LGrammar - A graphics tool for Lindenmayer systems in C and Java.
http://robotics.ee.uwa.edu.au/lgrammar/

Christian Jacob - A collection of papers related to using Mathematica to generate L-Systems.
http://pages.cpsc.ucalgary.ca/~jacob/Publications/Publications.html

An Introduction to Lindenmayer Systems - A basic introduction to L-Systems with some colourful examples.
http://www.biologie.uni-hamburg.de/b-online/e28_3/lsys.html

GDesign 1.0 - Generative art tools that create complex 2D and 3D objects breeding LSystems, Cellular Automata, and Shape Grammars. Freeware by Umberto Roncoroni.
http://www.digitalpoiesis.org

Wikipedia L-systems - A well rounded introduction to L-Systems.
http://en.wikipedia.org/wiki/Lindenmayer_system